Add DN42 specific whois handling

frontend/dn42.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func dn42WhoisFilter(whois string) string {
+	commandResult := ""
+	isNextSection := false
+	skippedLines := 0
+
+	// Filter out some long (and useless) keys
+	filteredPrefix := []string{
+		"descr:", "remarks:", "ds-rdata:", "auth:", "country:",
+		"nserver:", "status:", "pgp-fingerprint:", "mp-import:", "mp-export:",
+		"members:", "key:", "inetnum:", "inet6num:", "%",
+	}
+	for _, s := range strings.Split(whois, "\n") {
+		if len(s) == 0 {
+			// This line is a separation between parts of results
+			// Only keep last part of result
+			isNextSection = true
+			continue
+		}
+		shouldSkip := false
+		for _, filtered := range filteredPrefix {
+			if strings.HasPrefix(s, filtered) {
+				shouldSkip = true
+			}
+		}
+		if shouldSkip {
+			skippedLines++
+			continue
+		}
+
+		if isNextSection {
+			isNextSection = false
+			skippedLines = 0
+			commandResult = ""
+		}
+
+		commandResult += s + "\n"
+	}
+
+	return commandResult + fmt.Sprintf("\n%d line(s) skipped.\n", skippedLines)
+}